RELATED PARTY INFORMATION - WAKEFERN (Details) - USD ($)		12 Months Ended
	Feb. 15, 2014	Jul. 30, 2016	Jul. 25, 2015	Jul. 26, 2014
Related Party Transaction [Line Items]
Notes receivable from Wakefern		$ 42,735,000	$ 41,421,000
Wakefern
Related Party Transaction [Line Items]
Ownership interest in Wakefern		13.20%
Purchase obligation, as a percentage of merchandise requirements		85.00%
Purchase obligation period		10 years
Percentage of stockholders to request termination		75.00%
Indebtedness to Wakefern		$ 718,000
Installment payments year one		341,000
Installment payments year two		285,000
Installment payments year three		92,000
Installment payments after year four		0
Maximum per store investment		900,000
Per store investment increase		25,000	25,000
Additional investment		717,000	738,000
Vendor allowances and rebates		30,559,000	27,557,000	$ 26,438,000
Support services incurred charges		33,526,000	33,306,000	32,808,000
Demand deposits invested at related party Wakefern		63,609,000	35,428,000
Interest income earned on investments related entity		$ 2,506,000	$ 2,399,000	$ 2,622,000
Wakefern | Related Party Note Receivable Maturing August 2017
Related Party Transaction [Line Items]
Related Party Transaction, Basis Spread on Variable Rate	0.25%
Percent of notes receivable	50.00%
Wakefern | Related Party Note Receivable Maturing February 2019
Related Party Transaction [Line Items]
Related Party Transaction, Basis Spread on Variable Rate	1.25%
Percent of notes receivable	50.00%
Insure-Rite Ltd. | Wakefern
Related Party Transaction [Line Items]
Investment in Insure-Rite, Ltd		8.10%